http://abec35.com/products/Associate...%28GE3%29.html
if link doesnt work, just put in 10 x 16 b4.1 in the sites search bar and it will bring up all the dimensions. I was looking this up a while ago to put a b4.1 diff in a Annsmann gearbox to get the sizes but ended up machining the gearbox out to fit standard b4 bearing as I already had some spare.
Sorry about the angry face, sausage finger syndrome